EP 1830252 A3 20090204 - Specialised processing block for programmable logic device
Title (en)
Specialised processing block for programmable logic device
Title (de)
Spezieller Verarbeitungsblock für eine programmierbare logische Vorrichtung
Title (fr)
Bloc de traitement spécialisé pour dispositif logique programmable
Publication
Application
Priority
- US 77198906 P 20060209
- US 44732906 A 20060605
Abstract (en)
[origin: EP1830252A2] A specialized processing block for a programmable logic device includes circuitry for performing multiplications and sums thereof, as well as circuitry for rounding the result. The rounding circuitry can selectably perform round-to-nearest and round-to-nearest-even operations. In addition, the bit position at which rounding occurs is preferably selectable. The specialized processing block preferably also includes saturation circuitry to prevent overflows and underflows, and the bit position at which saturation occurs also preferably is selectable. The selectability of both the rounding and saturation positions provides control of the output data word width. The rounding and saturation circuitry may be selectably located in different positions based on timing needs. Similarly, rounding may be speeded up using a look-ahead mode in which both rounded and unrounded results are computed in parallel, with the rounding logic selecting between those results.
IPC 8 full level
G06F 7/544 (2006.01); G06F 7/499 (2006.01); H03K 19/173 (2006.01); H03K 19/177 (2006.01)
CPC (source: EP US)
G06F 7/49921 (2013.01 - EP US); G06F 7/49947 (2013.01 - EP US); G06F 7/49963 (2013.01 - EP US); G06F 7/5443 (2013.01 - EP US)
Citation (search report)
- [XY] US 5764555 A 19980609 - MCPHERSON THOMAS JOSEPH [US], et al
- [A] US 6571268 B1 20030527 - GIACALONE JEAN-PIERRE [FR], et al
- [Y] JP S61237133 A 19861022 - NEC CORP
- [Y] EP 0992885 A1 20000412 - TEXAS INSTRUMENTS INC [US], et al
- [Y] WO 2005101190 A2 20051027 - SANDBRIDGE TECHNOLOGIES INC [US], et al
- [A] US 4484259 A 19841120 - PALMER JOHN [US], et al
- [A] US 5404324 A 19950404 - COLON-BONET GLENN T [US]
- [A] US 6314442 B1 20011106 - SUZUKI HIROAKI [JP]
- [A] US 5790446 A 19980804 - YU ROBERT K [US], et al
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
EP 1830252 A2 20070905; EP 1830252 A3 20090204; CN 101042583 A 20070926; CN 101042583 B 20110302; JP 2007215192 A 20070823; JP 5069476 B2 20121107; US 2007185951 A1 20070809; US 8266198 B2 20120911
DOCDB simple family (application)
EP 07002429 A 20070205; CN 200710087956 A 20070208; JP 2007029842 A 20070208; US 44732906 A 20060605